Pumping apparatus.



No. .706,87. Patented Aug. 5, |902.

' T. G. E. LINDMARK.

PUMPING APPARATUS.

(Application Bled Jan. 17, 1900.)

(No Model.)

V/z//l/f BY IgA/@L7M J ATTORNEY rye mams Pzrpws 5:9, pugno-mvo.. wAsHmcTcN, o c

u TTEn f STATES PATENT OFFICE.

TORE GUSTAE EMANUEL LINDMARK, OF STOCKHOLM, SWEDENASSIGNOR, BY MESNE ASSIGNMENTS, TO DE LAVAL STEAM TURBINE COMPANY, A

CORPORATION OF NEV JERSEY.

PUMPING APPARATUS.

SPECIFICATION forming part of Letters Patent No. 706,187, dated August 5, 1902. Application filed January 17,V 1900. Serial No. 11818. (No model-J To all whom, it may concern:

Be it known that I, Tenn GUsTAF EMANUEL LINDMARK, a subject of the King of Sweden and Norway,and a resident of Stockholm,Swe

5 den, have invented certain new and usefulv Improvements in Steam-Turbine Pumping Apparatus, of which the following is a specification.

The object of my invention is to enable a le rapidly-rotating steamturbine,and especially those of the well-known De Laval type, to

drive centrifugal pumps for the purpose of lifting water up to heights of one hundred meters and over. Such steam-turbines run at a I5 speed of from nine thousand to thirty thousand revolutions per minute. V I propose to couple a centrifugal pump directly to the steam-turbine shaft. In such case although the pump may have small dimensions, yet

2c owing to its great speed it is capable when constructed and arranged as hereinafter set forth of lifting water up to the heights stated.

I have found by actual experiment that such a directly-coupled centrifugal pump driven e 5 by a steam-turbine at the high speeds noted will not operate effectively to raise water by its own suction. I have discovered, however,

that if means be provided for delivering water at suitable pressure into the chamber of 3e this fast-running pump then the insufficiency of the latter, due to its great peripheral speed,

is remedied and the high lifts of Water before noted are readily and economically obtained.

In order to show actual practical conditions 3 5 based on experiments, I will note the following results: I constructed a steam turbine having a disk three hundred millimeters in diameter and running at from fifteen thousand to sixteen thousand revolutions per min- 4o ute. Directly to the shaft of this Wheel Icoupled a centrifugal-pump wheel ninety millimeters in diameter. The cross-section of the inlet of the pump-wheel was 0.108 square decimeters. The pump was fed with water under 45 a pressure of from four to seven meters. The

results obtained with this pump when running at a speed of fifteen thousand four hundred revolutions per minute were as follows: height of delivery, one hundred and twenty-five 5o meters; quantity of water delivered per minute fourteen hund-red and forty liters. The pressure in the suction-pipe was then reduced from four meters to zero meters when the height of delivery, as well as the quantity of water, became diminished by ten per cent. 5 5 When the pressure of the feed-water was still further-reduced, so that a vacuum was created in the suction-pipe, the pump ceased to work regularly and the output was very greatly diminished, this illustration giving an 6o instance of a high-speed centrifugal pump directly coupled to a steam-turbine failing to raise waterto a desired height when the feedwater is not underpressure or by suction only. The apparatus, Wh'ich is hereinafter de- 65 scribed,was then constructed in the following manner: A turbine-disk of five hundred millimeters diameter was arranged to drive a small centrifugal pump directly connected to its shaft and also a larger pump connected 7o also to that shaft by reducing-gearing, so that the speed of this second and larger pump was fifteen hundred revolutions per minute, while that of the small pump was thirteen thousand revolutions per minute. Itwasfound that the 75 large pump operating alone at this low speed rapidly raised water by simple suction. The larger pump was connected to deliver its water into the chamber of the small fast-running pump. The results then were that the appa- 8o ratus delivered three thousand five hundred liters of water per minute against a head of one hundred and fifty meters. The great advantage, therefore, of the construction described is obvious. lt was found that the ap- 85 paratus continued to work Well even in such cases as when the water was sucked upward from a level seven meters lower than that of the pump.

It is apparent from the foregoing that the 9o said apparatus may be arranged in various ways familiar to the mechanic.

One operative and practical means of so arranging is illustrated in the accompanying drawing, which is a plan View. 9 5

In said drawing, l represents the casing inclosing the turbine wheel 2, mounted on the shaft 3 and journaled in bearings a and 5. To this turbine steam is admitted in the wellknown manner, and thereby said turbine is roo set in very rapid rotation. The turbine-shaft 3, projecting through the casing 1, carries a pinion 6, which pinion is placed between the two bearings 7 and 8.

At 11 is shown the main or fast-running centrifugal pump,which may be of anyknown construction. Said pump is provided with a shaft 10, supported in bearings12 and 13, carrying the pump-wheel 14. The shaft 10 of the pump 11 is coupled at 9 to the shaft 3 of the turbine wheel 2. It will therefore be seen that the pump-wheel 14 is directly driven by the turbine wheel and rotates at the same speed. f

At 15 is shown a large gear-wheel mounted on the shaft 16, journaled in bearings 17 and 18 on the same frame which carries the bearings 8 and 9. With this large gear 15 pinion 6 on shaft 3 engages.

21 isanothercentrifugal pump much larger than the centrifugal pump 11, having pumping-wheel 24, supported on a shaft 20, which passes through the bearings 22 23. The shaft 2O of the pump 21 is connected to the shaft 16 of the gear-wheel .15 by means of the coupling 19. The size of the pump 21 with respect to the pump 11 is to be such that the larger pump 21 will draw up and deliver tothe pump 11 a suiicient quantity of water under the necessary pressure to enable said pump 11 to accomplish the desired result. For this purpose the pressure-chamber 25 of the pump 21 is connected to the suction-chamber 26 of the pump 11 by the pipe 27.

It will be obvious from the foregoing construction, irst, that, as already stated, the smaller centrifugal pump 11 is driven at the speed of the turbine or from nine thousand to thirty thousand revolutions per minute; second, that by means of the gearing 6 and 15 the motion of the turbine-shaft is transmitted to the shaft 20 greatly reduced in speed. This speed is to be such as to enable the large pump 21 rapidly to perform its function of sucking -up the water to deliver the same to the smaller pump 1l.

I am well aware that it is old in the art to connect two pumps in series, so that one raises water and delivers it into the chamber of the other; butI am not aware that hitherto any construction has been devised whereby a steam-turbine running at such speeds as from nine thousand to thirty thousand revolutions per minute can be directly and eEectively coupled to a pump to cause the latter to raise water by reason of its high speed to such extreme elevations as one hundred meters and over. Such a device is therefore, in my belief, wholly new and pioneer in the art, and specifically I know of no instance where a steam-turbine shaft is used directly to opcrate a centrifugal pump and through reducing-gearing to operate a second pump adapted to deliver water into the chamber of the first pump for the purpose of producing the results already stated. I am also the first, so far as I know, to combine with a liquidraising device constructed to raise a given quantity of liquid at a given velocity means for continuously supplying feed to said device in greater quantity and at lower velocity.

I claim- 1. The combination of a steam-turbine, a pump actuated thereby, and means for continuously supplying feed under pressure to said pump; the aforesaid parts being constructed and arranged so that the said pump normally actuated by the said turbine at a speed too great to enable it through its own suction to raise liquid to a given height is enabled to do so by the supply of feed under pressure.

2. The combination of a steam-turbine, a rotary pump actuated thereby and means for continuously supplying feed under pressure to said pump, the aforesaid parts being constructed and arranged so that the said pump normally actuated by the said turbine at a speed too great to enable it through its own suction to raise liquid to a given height is enabled to do so by the supply of feed under pressure.

3. The combination of a steam-turbine, a rotary pump having its wheel on the shaft of said turbine, and a second pump constructed and arranged continuously to deliver feed to said first-named pump, as and for the purpose set forth.

4. The combination of a steam-turbine and two rotary pumps actuated thereby, one of said pumps being of high speed and small cubic capacity and the other of relatively low speed and large cubic capacity, and means whereby said second pump delivers liquid under pressure to said first pump.

5. The combination of a steam-turbine, a rotary pump having its wheel on the shaft of said turbine, a second rotary pump, speedreducing gearing between the said turbineshaft and the wheel of said second pump and a conduit connecting said pumps; whereby said second pump delivers feed under pressure to said rst pump.

6. The combination of a steam-turbine, a rotary pump having its wheel on the shaft of said turbine, a gear on said shaft, a second rotary pump, a gear on the shaft of said second pump engaging with said rst-n-amed gear and a conduit connecting said pumps; the said second pump being arranged to deliver feed under pressure through said conduit to said rst pump and the said gearing being constructed to actuate the shaft of said second pump at a speed less than that of the shaft of said first pump.

7. The combination with a steam-turbine of the shaft 3 thereof, gear 6 on said shaft, rotary pump 11 having wheel 14 on shaft 10, coupling 9 connecting shafts 3 and 10, shaft 16, gear 15 on said shaft engaging with gear 6, rotary pump 21 having wheel 24 on shaft 20, coupling 19 connecting shafts 16 and 20 and conduit 27 connecting pumps 11 and 21, substantially as described.

IOO

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8. In combination With a pump of given dithereof and means for continuously supply- 1e mensions of chamber and rate of speed and l ing feed under pressure to said pump. r means for driving said pump, a second pump In Witness whereof I have hereunto set my of greater dimensions of chamber and lower hand in presence of two Witnesses.

5 rate of s eed constructed and arranged to del 1 T liver feeld continuously to said lirst-named TORI] GUSIAB LM'ANULL MLDMMU" pump. Witnesses:

9. The combination of a steam-turbine, a WOLDEMAR BOMAN, rotary pump having its Wheel on the shaft II. RIDDERSTOLPE. 

